A method used to determine a ship's damaged stability by calculating a partial flooding as added weight rather than as lost buoyancy.


Related Terms

POPOV'S STABILITY CRITERION

A frequency domain stability test for systems consisting of a linear component described by a transfer function preceded by a nonlinear component characterized by an input-output function), with a unity gain feedback loop surrounding the series connection.

POLE-ZERO CONFIGURATION

A plot of the poles and zeros of a transfer function in the complex plane; used to study the stability of a system, its natural motion, its frequency response, and its transient response.

OVERTURNING

Failure of a retaining wall caused by the soil pressure overcoming the stability of the structure.

NYQUIST STABILITY THEOREM

The theorem that the net number of counterclockwise rotations about the origin of the complex plane carried out by the value of an analytic function of a complex variable, as its argument is varied around the Nyquist contour, is equal to the number of poles of the variable in the right half-plane minus the number of zeros in the right halfplane. Also known as Nyquist stability criterion.

NYQUIST DIAGRAM

A plot in the complex plane of the open-loop transfer function as the complex frequency is varied along the Nyquist contour; used to determine stability of a control system.

LYAPUNOV STABILITY CRITERION

A method of determining the stability of systems the water percolating through soils and determining the materials dissolved by the water.

L-5 TEST

An engine test in a General Motors diesel engine to determine detergency, corrosiveness, ring sticking, and oxidation stability properties of lubricating oils.

L-3 TEST

An engine test in a four-cylinder Caterpillar engine to determine stability of crankcase oil at high temperatures and under severe operating conditions.

HYDROFINISHING

A process for treating raw extracted base stocks with hydrogen to saturate them for improved stability.

VOLATILITY

This property describes the degree and rate at which a liquid will vaporize under given conditions of temperature and pressure. When liquid stability changes, this property is often reduced in value.

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